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Term

Abbreviation or Symbol

Term

Abbreviation or Symbol

		second (time)

		s

		tris(hydroxy methyl)aminomethane

		Tris

		serum glutamic oxalacetic transaminase

		SGOT

		tyrosinyl

		Tyr

		ultraviolet

		UV

		seryl

		Ser

		United States Pharmacopeia

		USP

		siemens

		S

		species

		sp. (sing.), spp. (pl.)

		uracil

		Ura

		uridine 5'-diphosphate

		UDP

		specific gravity

		sp gr

		standard deviation

		SD

		volt

		V

		standard error

		SE

		volume

		V

		standard temperature and pressure

		STP

		watt

		W

		weber

		Wb

		week

		wk

		steradian

		sr

		white blood cells (leukocytes)

		WBC

		subcutaneous

		s.c.

		tesla

		T

		xanthine

		Xan

		tobacco mosaic virus

		TMV

		xanthosine

		Xao

		xanthosine 5 -diphosphate

		XDP

		tonne (metric ton)

		t

		transfer ribonucleic acid

		tRNA

		xylose

		xyl

		year

		yr